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The Gunners defence has been heavily criticised this season and if they are to fight their way back into the Champions League then it is an area of the pitch that must be improved.

The man in question is Borussia Dortmund's Sokratis Papastathopoulos.

The 29-year-old has made 130 appearances for Dortmund since signing for them in 2013, but he could be set to test his ability in the Premier League.

LONDON, ENGLAND - NOVEMBER 29: Shkodran Mustafi of Arsenal reacts during the Premier League match between Arsenal and Huddersfield Town at Emirates Stadium on November 29, 2017 in London, England. (Photo by Julian Finney/Getty Images) (Image: Getty Images)

A centre-back is a priority for Arsenal, who are reportedly happy to offload Shkodran Mustafi after a season of disappointment.

Finally, Manchester United and Real Madrid will have to splash the cash if they are to land defender Kalidou Koulibaly.

His club, Napoli, have slapped a €120m price tag on him and it is not looking as if the team are willing to budge on that.

Chelsea are another side to be linked with the Senegal international, who originally joined the Italian club for €10m from Genk.

The defender is not only good at protecting his box, he is also a threat at the other end of the pitch.

He has scored five goals from 45 appearances for Napoli this season proving that he is able to cause problems from set pieces.